All indicators is that it doesnt work that way. Yes there are bloodlines. But the greater majority seem to just spring up on their own. And that the Force can, and will make more if it deems so.
The idea's not really based on any of that. It's not incompatible with force users springing up spontaneously, and doesn't need bloodlines or descent. All it requires is population booms and crashes. Which could, if you want, be based on the will of the Force. The cycles might have some greater spiritual meaning, anything from the necessity of change, to a crucible or test.